Automatic door-closing mechanism.



Nb. 727,097. PATENTED MAY 5, 1903. I W. A. GROSS.

AUTOMATIC DOOR CLOSING MEGHA-NISM.

APiLIOATION FILED JUNE 20, 1.902.

UNITED STATES Patented May 5, 1903.

I PATENT OFFICE.

WILLIAM A. OROSSQOF CHICAGO, ILLINOIS.

SPECIFICATION forming part of Letters Patent N 0. 727,097, dated May 5, 1903.

-- Application filed June 20. 1902. Serial No. 112,407. .No model.)

To (all whom it may concern.-

Be it known that I, WILLIAM A. CRoss,-a

citizen of the United States of America, and

and State of Illinois, have invented'certain new and useful Improvements in Automatic Door-Closing Mechanism, of which the following is a specification.

The present invention relates to an automatic mechanism for closing the well-doors of elevators, and has for its object to provide a simple and efficient automatic operating mechanism that with the elevator cage or platform reaching a proper floor or'level will antomatically cause an opening of the welldoors at such floor or level and with a departure of the cage or platform from such floor or level will automatically cause such doors to return to a closed position, all as will hereinafter more fully appear and be more particularly pointed out in the claims.

In the accompanying drawings, illustrative of the present invention, Figure l is a verti-' cal sectional elevation of an elevator-well, illustrating the application of the present invention to the vertically-moving doors by which the tier of openings into the well are closed, parts being broken away to better illustrate the arrangement of the present invention; Fig. 2, a diagrammatic view illustrating the electrically-actuated mechanism of the present invention.

Similar numerals of reference indicate like parts in both views.

Referring to the drawings, 1 represents the usual elevator-well, in which doorways are formed at the difierent floors of the building, and 2 the elevator cage or platform, arranged to move vertically in such well in any usual manner.

3 and 4 are the respective upper-and lower sections or halves of the series of doors which normally close the series of doorways or openings of the elevator-well. Such halves or sections are operatively connected together, so as to simultaneously'move in opposite directions in the operation of opening or closing a particular doorway or opening in the elevatorwell. The connection imposing such simultaneous movement upon the door-sections in opposite directions will consist of the usual chain and pulley connections 5 and 6, an example of which may be found in my prior patent of May 19, 1896, No. 560,396. Such special type of door is, however, merelyused to illustrate the present invention, and any other usual and suitable type of doormay be employed in connection with the present invention where circumstances or the .judgment of the constructor may so indicate.

In the special type of apparatus shown in the drawings, 7 is a horizontally-arranged endless chain belt moving in unison with the chain andpulley connections 5 and 6 of the doors and provided with an operating finger or lug 8, which in the movement of the endless chain 7 in unison with the movement of the door-sections isadapted to have a reciprocatingmovem'ent in a horizontal plane for automatically operating the cut-out switches, as hereinafter more fully described.

9 is a reversible electric motor of any usual type, the armature shaft of which is provided with a pulley 10, that is connected by a chain or other flexible belt 11 with a pulley 12, secured to the carrying-shaft of one of the pulleys 6, heretofore described, the arrangement being such that the motor is adapted to impart positive opening and closing movements to the door-section's in the automatic manner hereinafter described.

13 is a pole-changer of any usual and suitable construction, secured to the wall of the elevator-well, with its movable arms 14. arranged'to project into the path of an operating cam-plate 15, carried by-the elevator cab or platform 2, thearrangement being such that with the elevator cab or platform on the proper level with the particular door of the building the cam-plate 15 will be in active engagement with the movable arm 14 to hold the same in a reversed position and with the current directed to the motor, so that the same will tend to operate the door-sections into an open position. i I

16 is a spring tending to hold the movable arm 14 in a' position the reverse to that already described "and with the current directed to the motor, so that the same will tend to operate the door-sections into a closed position. The last-described condition is the normal one of the various-pole-change rs employed and is only changed when the elevator cab or platform reaches the proper proximity to a particular pole-changer.

The connections and circuits between the source of electrical power, the pole-changer, motor, 850., are usual and common to reversible motors, and, in connection with diagram view Fig. 2, will be clearly understood by those skilled in the art.

17 and 18 are a pair of circuit breakers or switches located between a pole-changer 13 and motor 9 and arranged in the path of the reciprocating operating-finger 8, heretofore described, and near the respective terminals of such path, so that as said operating-finger nears the terminal of its movement in either direction, and which terminal or final movements of the said finger are coincident with the final closing and opening movements of the door-sections, the said finger will break or interrupt the active circuit of the motor to prevent further rotation of the same.

Having thus fully described my said invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In an automatic operating mechanism for elevator hatchway-doors, the combination of a sliding door formed in two sections, an intermediate connection imposing simulta neous movement on such door-sections to and from each other, an electric motor operatively connected with and adapted to open and close the door-sections, a pole-changer in circuit with said motor, an elevator cab or platform, a projection carried by said cab and adapted to operate the pole-changer in a passage past the same, a normally closed circuit-breaker in circuit with the electric motor, and means moving in unison with the door-sections for opening said circuit-breaker as said door-sections reach their closed position, substantially as set forth.

2. In an automatic operating mechanism for elevator hatchway-doors, the combination of a sliding door formed in two sections, an intermediate connection imposing simultaneous movement on such door-sections to and from each other, an electric motor operatively connected with and adapted to open and close the door-sections, a pole-changer in circuit with said motor, an elevator cab or platform, a projection carried by said cab and adapted to operate the pole-changer in a passage past the same, a pair of independent normally closed circuit-breakers in circuit with the electric motor, and means moving in unison with the door-sections for alternately opening said circuit-breakers as the door-sections alternately reach their closed and open positions, substantially as set forth.

3. In an automatic operating mechanism for elevator hatchway-doors, the combination of a sliding door formed in two sections, an intermediate connection imposing simultaneous movement on such door-sections to and from each other, an electric motor operatively connected with said intermediate connection and adapted to open and close the door-sections, a pole-changer in circuit with said motor, an elevator cab or platform, a'projection carried by said cab and adapted to operate the pole-changer in a passage past the same, a normally closed circuit-breaker in circuit with the electric motor, and means movingin unison with the door-sections for openingsaid circuit-breaker as said sections reach their closed position, substantially as set forth.

4. In an automatic operating mechanism for elevator hatchway-doors, the combination of a sliding door formed in two sections, an intermediate connection imposing simultaneous movement on such door-sections to and from each other, an electric motor operatively connected with said intermediate connection and adapted to open and close the door-sections, a pole-changer in circuit with said motor, an elevator cab or platform, a projection carried by said cab and adapted to operate the pole-changer in a passage past the same, a pair of independent normally closed circuitbreakers in circuit with the electric motor, and means moving in unison with the .doorsections for alternately opening said circuit breakers as the door sections alternately reach their closed and opened positions, substantially as set forth.

5. In an automatic operating mechanism for elevator hatchway-doors, the combination of a sliding door formed in two sections, an intermediate connection imposing simultaneous movement on such door-sections to and from each other, an electric motor operatively connected with and adapted to open and close the door-sections, a pole-changer in circuit with said motor, means for yieldingly holding said pole-changer in one position, an elevator cab or platform, a projection carried by said cab and adapted to reverse the position of such pole-changer by engagement therewith in the passage of the elevator-cab, a normally closed circuit-breaker in circuit with the electric motor, and means movingin unison with the door-sections for opening said circuitbreaker as said door sections reach their closed position, substantially as set forth.

6. In an automatic operating mechanism for elevator hatchway-doors, the combination of a sliding door formed in two sections, an intermediate connection imposing simultaneous movement on such door-sections to and from each other, an electric motor operatively connected with and adapted to open and close the door-sections, a pole-changer in circuit with said motor, means for yieldingly holding said pole-changer in one position, an elevator cab or platform, a projection carried by said cab and adapted to reverse the position of such pole-changer by engagement therewith in the passage of the elevator-cab, a pair of independent normally closed circuit-breakers in circuit with the electric motor, and means moving in unison with the door-sections for alternately opening said circuitbreakers as the doorsections alternately IIO reach their closed and opened positions, substantially as set forth.

7. In an automatic operating mechanism for elevator hatchway-doors, the combination 7 mally closed circuit-breaker in circuit with the electric motor, and means carried by the endless connect-ion aforesaid for opening said circuit-breaker as said door-sections reach their open position, substantially as set forth.

8. In an automatic operating mechanism for elevator hatchway-doors, the combination of a sliding door formed in two sectionsfa pair of pulley and flexible connections imposing 2 5 simultaneous movement onsuch door sections to and from each other, an endless flexi-' ble connection extending from one pulley to the other, an electric motoroperatively'connected with one of said pulleys and adapted 30 to open and close the door-sections, a polechangcr in circuit With said motor, an elevator cab or'platform, a projection carried by said cab and adapted to operate the polechangerin a passage past the same, a pair of 5 independent normally closed circuit-breakers in circuit with the electric motor,'and

means carried by the endless connection 7 aforesaid for alternately opening said circuitbreakers as the door-sections alternately'4o reach their closed and'opened positions, substantially as set forth.

Signed at Ohicago,-Illinois, this 14th day of J une, 1902.

WILLIAM A. CROSS. Witnesses:

ROBERT BURNs, HENRY -A. 'No'r'r. 

